Subzero is one of the available maps in Battle Bay. It is unlocked at 0 infamy. Subzero is a giant sub torn apart by the cold unforgivingness of subzero, but now it is a battle arena for the crew. It is located in the far left of home island, but be careful with your shots as the waves are very strong and can deflect airborne projectiles.
With a somewhat low amount of cover (except waves), Subzero favors mid to long range combat, from mortars to torpedoes and ranged point damage weapons.
As part of the 2.7 update and Christmas, from December 19, 2017 to ?, 2018, Subzero had a Christmas theme.